<template>
    <div class="app-container">
        <h2 style="text-align: center;">发布新课程</h2>
        <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
        <el-step title="填写课程基本信息"/>
        <el-step title="创建课程大纲"/>
        <el-step title="最终发布"/>
        </el-steps>

        <!-- 添加章节 -->
        <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
        <!-- 添加和修改章节表单弹窗 -->
        <el-dialog :visible.sync="dialogChapterFormVisible" title="章节信息">
            <el-form :model="chapter" label-width="120px">
                <el-form-item label="章节标题">
                    <el-input v-model="chapter.title"/>
                </el-form-item>
                <el-form-item label="章节排序">
                    <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
                <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
            </div>
        </el-dialog>

        <!-- 添加和修改课时表单弹窗 -->
        <el-dialog :visible.sync="dialogVideoFormVisible" title="课时信息">
        <el-form :model="video" label-width="120px">
            <el-form-item label="课时标题">
            <el-input v-model="video.title"/>
            </el-form-item>
            <el-form-item label="课时排序">
            <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
            </el-form-item>
            <el-form-item label="是否免费">
            <el-radio-group v-model="video.isFree">
                <el-radio :label="true">免费</el-radio>
                <el-radio :label="false">默认</el-radio>
            </el-radio-group>
            </el-form-item>
            <el-form-item label="上传视频">
                <el-upload
                    :on-success="handleVodUploadSuccess"
                    :on-remove="handleVodRemove"
                    :before-remove="beforeVodRemove"
                    :on-exceed="handleUploadExceed"
                    :file-list="fileList"
                    :action="BASE_API+'/eduvod/video/uploadVideoAliyun'"
                    :limit="1"
                    class="upload-demo">
                <el-button size="small" type="primary">上传视频</el-button>
                <el-tooltip placement="right-end">
                    <div slot="content">最大支持1G，<br>
                        支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                        GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                        MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                        SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                    <i class="el-icon-question"/>
                </el-tooltip>
                </el-upload>
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
            <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
        </div>
        </el-dialog>

        <!-- 章节 -->
        <ul class="chanpterList">
            <li v-for="chapter in chapterVideoList" :key="chapter.id">
                <p>
                    {{ chapter.title }}
                    <span class="acts">
                        <el-button type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                        <el-button style="" type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                        <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                    </span>
                </p>
                <!-- 视频 -->
                <ul class="chanpterList videoList">
                    <li v-for="video in chapter.children" :key="video.id">
                        <p>{{ video.title }}
                            <span class="acts">
                                <el-button type="text" @click="openEditVideo(video.id)">编辑</el-button>
                                <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                            </span>
                        </p>
                    </li>
                </ul>
            </li>
        </ul>

        <el-form label-width="120px">
        <el-form-item>
            <el-button @click="previous">上一步</el-button>
            <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
        </el-form-item>
        </el-form>
    </div>
</template>
<script>
    import chapterApi from '@/api/edu/chapter'
    import videoApi from '@/api/edu/video'

    export default {
        data() {
            return {
                saveVideoBtnDisabled: false,
                saveBtnDisabled: false, // 保存按钮是否禁用
                courseId: '',
                chapterVideoList: [],
                chapter: {  //封装章节的数据
                    title: '',
                    sort: 0
                },
                video: {
                    title: '',
                    sort: 0,
                    isFree: 0,
                    videoSourceId: '',
                    videoOriginalName: ''   //文件名称
                },
                dialogChapterFormVisible: false,     //章节弹窗
                dialogVideoFormVisible: false,     //小节弹窗
                fileList: [],                       //上传文件列表
                BASE_API: process.env.BASE_API      // 接口API地址
            }
        },
        created() {
            //获取路由中的id值
            if(this.$route.params && this.$route.params.id) {
                this.courseId = this.$route.params.id
                //根据课程id查询章节和小节
                this.getChapterVideo()
            }
        },
        methods: {
            //上传视频成功后调用的方法
            handleVodUploadSuccess(response, file, fileList) {
                //将上传之后的视频id赋值
                this.video.videoSourceId = response.data.videoId
                //将上传之后的视频名称赋值
                this.video.videoOriginalName = file.name
            },
            //视图上传多于一个视频
            handleUploadExceed() {
                this.$message.warning('想要重新上传视频，请先删除已上传的视频')
            },
            //删除之前弹窗
            beforeVodRemove(file, fileList) {
                return this.$confirm(`确认移除 ${ file.name }?`)
            },
            //确认删除
            handleVodRemove() {
                //调用接口中删除的方法
                videoApi.deleteVodVideo(this.video.videoSourceId)
                    .then(response => {
                        //提示
                        this.$message({
                            type: 'success',
                            message: '删除视频成功!'
                        })
                         //把文件列表清空
                        this.fileList = []
                        //把video中的视频id和视频name清空
                        this.video.videoSourceId = ''
                        this.video.videoOriginalName = ''
                    })
            },

            //小节弹窗
            openVideo(chapterId) {
                //弹出小节弹窗
                this.dialogVideoFormVisible = true
                //设置章节id
                this.video.chapterId = chapterId
                this.video.id = ''
                this.video.title = ''
                this.video.sort = 0
                this.video.isFree = 0
                this.video.videoSourceId = ''
                //把文件列表清空
                this.fileList = []
            },
            //修改小节弹窗数据回显
            openEditVideo(videoId) {
                //弹窗
                this.dialogVideoFormVisible = true
                videoApi.getVideo(videoId)
                    .then(response => {
                        this.video = response.data.eduVideo
                        if(this.video.videoSourceId === "") {
                            this.fileList = []
                        }else {
                            this.fileList = [ {"name": `${this.video.videoOriginalName}`}]
                        }
                    })
            },
            //添加小节
            addVideo() {
                //设置课程id到video中
                this.video.courseId = this.courseId
                videoApi.addVideo(this.video)
                    .then(response => {
                        //关闭弹窗
                        this.dialogVideoFormVisible = false
                        //提示
                        this.$message({
                            type: 'success',
                            message: '添加小节信息成功!'
                        })
                         //刷新页面
                        this.getChapterVideo()
                    })
            },
            //修改小节
            updateVideo() {
                videoApi.updateVideo(this.video)
                    .then(response => {
                        //关闭弹窗
                        this.dialogVideoFormVisible = false
                        //提示
                        this.$message({
                            type: 'success',
                            message: '修改小节信息成功!'
                        })
                         //刷新页面
                        this.getChapterVideo()
                    })
            },
            //删除小节
            removeVideo(videoId) {
                this.$confirm('此操作将删除小节，是否继续？', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).then( () => {    //点击确定执行then方法
                    //调用删除的方法
                    videoApi.deleteVideo(videoId)
                        .then(response => { //删除成功
                            //提示
                            this.$message({
                                type: 'success',
                                message: '删除成功!'
                            })
                            //回到列表页面
                            this.getChapterVideo()
                        })

                })
            },
            saveOrUpdateVideo() {
                if(this.video.id) {
                    this.updateVideo()
                }else {
                    this.addVideo()
                }
            },


            //弹出章节的页面
            openChapterDialog() {
                //弹窗
                this.dialogChapterFormVisible = true
                //表单数据清空
                this.chapter.title = ''
                this.chapter.sort = 0
            },
            //修改章节弹窗数据回显
            openEditChapter(chapterId) {
                //弹窗
                this.dialogChapterFormVisible = true
                chapterApi.getChapter(chapterId)
                    .then(response => {
                        this.chapter = response.data.eduChapter
                    })
            },
            //添加章节
            addChapter() {
                //设置课程id到chapter中
                this.chapter.courseId = this.courseId
                chapterApi.addChapter(this.chapter)
                    .then(response => {
                        //关闭弹窗
                        this.dialogChapterFormVisible = false
                        //提示
                        this.$message({
                            type: 'success',
                            message: '添加章节信息成功!'
                        })
                         //刷新页面
                        this.getChapterVideo()
                    })
            },
            //修改章节
            updateChapter() {
                chapterApi.updateChapter(this.chapter)
                    .then(response => {
                        //关闭弹窗
                        this.dialogChapterFormVisible = false
                        //提示
                        this.$message({
                            type: 'success',
                            message: '修改章节信息成功!'
                        })
                         //刷新页面
                        this.getChapterVideo()
                    })
            },
            //删除章节
            removeChapter(chapterId) {
                this.$confirm('此操作将删除章节，是否继续？', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).then( () => {    //点击确定执行then方法
                    //调用删除的方法
                    chapterApi.deleteChapter(chapterId)
                        .then(response => { //删除成功
                            //提示
                            this.$message({
                                type: 'success',
                                message: '删除成功!'
                            })
                            //回到列表页面
                            this.getChapterVideo()
                        })

                })
            },
            saveOrUpdate() {
                if(this.chapter.id) {
                    this.updateChapter()
                }else {
                    this.addChapter()
                }
            },
            //根据课程id查询章节和小节
            getChapterVideo() {
                chapterApi.getAllChapterVideo(this.courseId)
                    .then(response => {
                        this.chapterVideoList = response.data.allChapterVideo
                    })
            },
            previous() {
                this.$router.push({ path: '/course/info/' + this.courseId })
            },
            next() {
                this.$router.push({ path: '/course/publish/' + this.courseId })
            }
        }
    }
</script>

<style scoped>
    .chanpterList{
        position: relative;
        list-style: none;
        margin: 0;
        padding: 0;
    }

    .chanpterList li{
        position: relative;
    }

    .chanpterList p{
        /* float: left; */
        font-size: 20px;
        margin: 10px 0;
        padding: 10px;
        height: 70px;
        line-height: 50px;
        width: 100%;
        border: 1px solid #DDD;
    }

    .chanpterList .acts {
        float: right;
        font-size: 14px;
    }

    .videoList{
        padding-left: 50px;
    }

    .videoList p{
        /* float: left; */
        font-size: 14px;
        margin: 10px 0;
        padding: 10px;
        height: 50px;
        line-height: 30px;
        width: 100%;
        border: 1px dotted #DDD;
    }
</style>